Kubiak, T. M., & Benbow, D. W. (2017). The Certified Six Sigma Black Belt Handbook (2nd ed.). Pearson Education India Pvt. Ltd.
Lua i Stíl Chicago (17ú heag.)Kubiak, T. M., agus Donald W. Benbow. The Certified Six Sigma Black Belt Handbook. 2nd ed. New Delhi: Pearson Education India Pvt. Ltd, 2017.
Lua MLA (9ú heag.)Kubiak, T. M., agus Donald W. Benbow. The Certified Six Sigma Black Belt Handbook. 2nd ed. Pearson Education India Pvt. Ltd, 2017.
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